Early model tb to later model ls4
11-16-2012, 01:19 PM
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Early model tb to later model ls4 Ive just learned that the earlier model ls4s came with a 8 pin throttle body while the later models have a 6 pin connector. Anyone able to shine so light on this rewiring subject. ive search and cannot find the wiring diagram. 
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11-17-2012, 11:45 AM
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I'm not a 100% this will work? But for the price of the plug I'd try it. I have the pt# for the 6 pin around here some where, but I'm walking out the door as soon as I get a chance I'll post it up.
11-18-2012, 07:33 AM
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Here is the pinout for the 8-pin LS4 TB.
Notice it has dual Low Reference wires (grounds) and dual 5-Volt Reference wires. If you look closely at the wiring schematics (atleast on the E67 ECM), the Low Ref wires are connected internally and the ECM uses two banks of 5V ref with all the 5V Refs connected to one of these two banks.
To wire up a 6 wire TB, you can either wire the redundant wires together (splice the two Low Ref wires together, then connect to the single Low Ref wire on the 6-wire TB and do the same for the 5V ref wires) or just leave one of the Low Ref and 5V Ref wires unconnected.
Code:
Pin Wire Color Circuit No. Function A D-GN 485 TP Sensor 1 Signal B L-BU 6295 5-Volt Reference 2 C TN 2752 Low Reference D PU 486 TP Sensor 2 Signal E YE 581 TAC Motor Control - 1 F BN 582 TAC Motor Control - 2 G GY 2701 5-Volt Reference 2 H L-BU/BK 6297 Low Reference
To wire up a 6 wire TB, you can either wire the redundant wires together (splice the two Low Ref wires together, then connect to the single Low Ref wire on the 6-wire TB and do the same for the 5V ref wires) or just leave one of the Low Ref and 5V Ref wires unconnected.
11-18-2012, 09:41 AM
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I believe you need the 8 way connector, pt# 13530777. You can order from Mouser Electronics. You'll also need 2 pins to splice into your wiring harness, pt# 121918-L. I would 12 or so of the pins in case a couple of them get screwed up. Like I said I'm not a 100% on this, but I would try it for the price.
11-18-2012, 09:54 AM
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Davidgxp shipped me the harness cut from his car with the throttle body. Is this like the truck tb where there's a shot the tb won't work correctly? Ie they use different voltage?
